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the following data (s) are given as the ...

the following data (s) are given as the standed enthalpies of combustion of `C(s),H_(2)(g) and CH_(4)(g)and -393.5kJ mol ^(-1) 285.8 kJmol^(-1) and -890.4 kJ mol^(-1)` respectively at 298 K . The standed enthalpy of fromation of methation of methane `[CH_(4)(g)]` is

A

`+ 724 . 42 kJ mol^(-1)`

B

`+74.7 kJ mol^(-1)`

C

`-114.82 kJ mol^(-1)`

D

`-194.62 kJ mol ^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
b
`underset(-393.5)(C(s))+ underset(-285.8)(2H_(2)(g))tounderset(-890.4)(CH_(4)(g)`
`Delta_(r)H(CH_(4)(g))=Delta_(c)H^(-)(C)-Delta_(C)H^(-)(H_(2)(g))xx2`
` -890.4 -(-393.5)-(-285xx2)`
`+74.7 kJ//mol^(-1)`
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